Tachycardia characteristics
VA during Tc
Short VA (<60 ms)
-
Typical slow-fast AVNRT
-
Junctional tachycardia
-
Atrial tachycardia
-
Ventricular tachycardia
​
Long VA (>60ms)
-
Atypical AVNRT
-
AVRT
-
Atrial tachycardia
-
Ventricular tachycardia
BBB during SVT
VA increase
-
consistent with ipsilateral BBB for orthodromic AVRT
​
No change in VA
-
Nothing ruled out
-could be ipsilateral pathway that is close to septum​
-could be contralateral pathway
-could be AVNRT
-could be ATc
Tachycardia termination
Ends with an A
-
Atrial tachycardia very unlikely
-
Could still be
-​VT
-AVNRT
-AVRT
​
Ends with a V
-
VT very unlikely
-
Could still be ​
-Atrial tachycardia
-AVNRT
-AVRT
Ends with an A​
Ends with a V​
V to A ratio
CL wobble
A leading the V
-
Ventricular tachycardia ruled out
-
Could still be
-​ATc
-AVNRT
-AVRT
​
V leading the A
-
Rules out ATc
-
Could still be ​
-VT
-AVNRT
-AVRT